Hotspots of reactive nitrogen loss in China: Production, consumption, spatiotemporal trend and reduction responsibility
2021
Luo, Zhibo | Liang, Xia | Lam, Shu Kee | Mosier, Arvin R. | Hu, Shanying | Chen, Deli
Effective and fair mitigation measures hinge on the identification of hotspots and tracking provenance on reactive nitrogen (Nr) loss at a high spatial resolution. We assessed the Nr loss intensity in China at 1 km spatial resolution from 1980 to 2015. The total Nr loss increased from 20.2 to 54.5 Tg N yr⁻¹, with hotspots (>100 kg N ha⁻¹ yr⁻¹) concentrated in the North China Plain, the Middle and Lower Yangtze River and the Sichuan Basin. The Nr loss hotspots covered less than 20% of the Chinese territory but contributed more than 90% of total Nr loss since 1990. Geographical disparity in Nr loss has increased and calls for a fair regional policy synergy. Compared to managing Nr loss based only on production, we demonstrate that the estimation of Nr loss responsibility driven by consumption has greater potential to allocate a fair share of responsibility for reducing Nr loss.
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